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The article you requested is

Cytochrome P450 2D6 Polymorphism and Its Impact on Decision-Making in Psychopharmacotherapy: Finding the Right Way in an Ultrarapid Metabolizing Patient

J Clin Psychiatry 2011;72(11):1465-1467
10.4088/JCP.11cr07119

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The cytochrome P450 (CYP) superfamily represents the most important phase I drug metabolizing enzyme system. Genetic mutations play an important role in the activity especially of CYP2D6. Genetic polymorphisms within CYPs affect the metabolism of drugs as substrates for the particular enzymes, resulting in variations in plasma levels of the drugs, differences in drug response, or altered risk for adverse effects.